If you want to experience Hollow Knight away from your PC or console, you can use legitimate cloud gaming and local streaming services safely.
While unofficial methods exist, the best "extra quality" experience often comes from official, high-fidelity streaming services like Shadow PC or by using high-quality emulation platforms, ensuring you can dive into the depths of Hallownest without compromise.
If you own it on PC, you can stream it to your phone for free using the official Steam Link app. If you'd like to tailor this more, let me know: Is this for a tech-savvy audience or casual gamers ?